SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bebcf5d1338b4738b239c245af852d343cb4757c690e40e9aa1fa0a7377ecf8' 
  AND token = 'W3OPRX2Gz145soqkfhquUXzJBdiDZlJiyyCfzqUB5KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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