Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27a96dc399997d616f73d37bb67c098cc5f4162f99f2eea4149dd666273ad4a3' 
  AND token = 'GP2+UTIdjk/9dhwdSVw8krj37NaxiRZpR4er82ak2Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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