SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ef7aa520fb1441a8f3fdb52286472bcb707262eb7a21fd4359f8f58e01f6f02' 
  AND token = 'gockt4m7uPqQH6V6/uuKXmvLQ48zBJMZDKYx/Tg+P6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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