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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67cd2dfb83efbce3659fb31ea1e59413438a794649241621d8a7b6592d788fc4' 
  AND token = 'HD7p1apb8637ffXWoZaAnTTGUNcCpRG8w1D0DpgiNVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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