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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ff2311a43bb247d1b3dc20530092d84b7472afbfb4f2a9da615d76a27ee93c' 
  AND token = 'qN0UbIzrcwTpjWKUd5yQ5v9b0HJ+DcU5CRP7RsTb6y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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