SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2264d736b4bbfd12ae980dd5b4da92899b61573333a685e61ff70734d1539d8c' 
  AND token = 'mcFAk07HdxAKWAmHzG9PVO3GBxZumt5I/O4EY7bSswU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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