SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '107a95ba9c47051db64763bffeaf5f31780e6dbe38c25f6caf310ef3156b9089' 
  AND token = 'ahEXkvSdJZi5+gUwm41cPmN5N/ucg+BEA2QIzVQK8dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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