SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57458b85b7b1f47d4cb640157f4edd3ec0e662829d407b8f46bb093bd4355ec3' 
  AND token = 'BKKGIDufnOAazVhFh1Tm+IWBLMzshQjqXhxjtwrAAJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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