Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa9fe384ea7774084ef6cccb5870ff6a09e34771349b4279c877cd309c3c234a' 
  AND token = 'cAcoYcAC4Y8qg8oSblWJ+STQiZkZM+2qOzdGxua++Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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