SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f562981ed6d6de19f0af8f87cf75d7e4f256eb048c074f2a1b274421978ec1d' 
  AND token = 'Vvb3jqviJPNOZXoEhO2JMln9VwOnI6EVTqcKQfQK45s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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