SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18043f2467b5c355fce32aa92185fb820d1861282d6a404a0bf0897e1ca92778' 
  AND token = 'p/oG4/zKcre6jcUP+nuETIGtYXfsV+9H2rhzQriUJfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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