SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db5edeeb8a03b96c3b56b12e38c984d2eb7c022d21f3a9e0aa0b5f313ff597f0' 
  AND token = 'LV+SP/Qc2hrmB/WCv7VaNvCRlHmi7kUGomFJZD5hlwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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