Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e85a74b056e20d75a0768972ee60637e45d14e3ac26f6f0bc731fd68715b1b1a' 
  AND token = 'gtysvTwFYeuJgeuv2d2OkWFnhf0J9+tVTLHpaauALDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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