SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffbfdd89fdfbdb1285392de10d12ec5fffc7d66743253ae499007afa74a19e7e' 
  AND token = 'Wg8zZZ2whcYhJ/lLCmThh25DG1R40BNIHVDDPcx/yOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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