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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c770c1a87c3c080514139f52dec9d9b5dcd70313260858768a57f872dece5934' 
  AND token = 'DYwrfkgIzADlNxZERf+Ae7JQngwPtUWoPGMmCIqUIqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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