SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a0382f3e454ce174d2265fe6678d7b03c22781cd5918bd460fa513106c9beea' 
  AND token = 'OLy7B8qZlghFKBOJIN3/L3tTfRStgKVuScxxnOUgtzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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