SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '927c036ec8f9bddb30cf85bd09be33a7017678372d910bfa9fe47e6c61104750' 
  AND token = '3MLzBwavV7uzLOqDc/q74gsknGdnnU/PLQmE3YrXn3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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