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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ed9b9962b44e98a9907762f2f50021433c8fceeea5276c6c64b795f5150c4dc' 
  AND token = 'OjfvLIepriLiRaIUbG3wuWvxmC6fc7kz9h5m0ZSz4V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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