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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99686c66ea21b2bbcfdaf2eab8dda253f83bf14331758bb3f6e6a88c4f56736f' 
  AND token = 'j5qHFEKNyH049Jmce3TxvBh7cfeDGD6vT52dpTnlAR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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