Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfeeafc864cf7a7767cc194a781cbaa855cd053c70b5e8842a24a498b86ad3c6' 
  AND token = 'FrMSY5UAkSPXB3UQjh5IAqkgn1AtM3yZOWE0U8JcpU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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