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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92b24a4f25d1b658a1895a9cd7478f6feea9aa4673982171ef1b33cfb0bc3dc' 
  AND token = 'k8pHBsqVsqfkRx+TZK7+zeoRzsa16zxwUDBES5q3C9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}