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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93cee641a3d543872b5b6b81e96548619e417731487189be580d1fa8ef000a7c' 
  AND token = 'I0WMs3Ax7TWXNVLJwwtUwT+cVfl+B1z2LDvkQiu4DBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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