SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e570be41a126f6f88703c80a01fcf81348aa9b498de7725c1046a22c4313054' 
  AND token = 'sIaJvqhCISEZYpwzMMUVqBbCq5nl9n7AY0Hvziz1nns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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