SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a28ef30a95477283edb8ed24422f7a5285571a7f78104c9987d87a66b2f85d0' 
  AND token = 'nBLMO6bSvHrg31MlIfzZ7hGgrnX4U/XsGaECrjIjFCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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