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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde1df1febd1c738854c995fb44a322559ebee84bc5a7302c853c6b4ecf20fc2' 
  AND token = 'ImX+E5REcy4J0kvEGngF8OzXCmnBJQ0eIbZRoF4O+uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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