SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efcd82526fbc98e24888deb784a7a2f2de3172ee11e833ddd95927c7a897f3ef' 
  AND token = 'a+Clxn/uokL/zvig3ri8Ej6iWhQK9ncqzVPdUHxwB2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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