Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3849b41540ab86691eea982a9007ed746e597dc7f6767b371fde953381b201e8' 
  AND token = 'eD0/ydIpYaFzDTV3MOyWcRSJvHV/vEPThjDmkjC2JNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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