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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6034fa964656249ca58acfaabfdb78a32db8459ac8f10090f4b95c915c0a57c' 
  AND token = 'IJ8txF0pW+OmgTz9+zzH9seisRRRo3/7dcL1C5EPteY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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