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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c99a57b307cce69e51ae12859dfd5d42e911da111b50f3dfeae9a0dde563ccb6' 
  AND token = 'iGBU5EsNyyJDS3DZpk15o48tZbZjOzBLL6jQpS6TPSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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