SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4179623b8b94b5194254d75965a907d98ca1baa816fe009ce828d1df93f86d0' 
  AND token = 'jJuazBOBcG/+YTynkEn6BKF2ffPoEqUZIPX8g0pAa20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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