SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80d316ff9514aed0d4d622e1c5dc767191b19fb61a26f36e514d00a056f7a75a' 
  AND token = 'XwL4wzPuKTt5Jtr8LNa/FBulj45KeWg9C4Dv6E/PZsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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