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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4203c875fb6bd7f9f965015ebb2ca88cbbefac2eaa2d50907dd4a6eabe25cb2' 
  AND token = 'GmKFKDd2EVs+ki5o1QvZ/EHYLvTKe1KkM/zehNk6vf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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