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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0935d7f744b06bba66f3c7dd25e401ce9818c2721bbe481418e0b0bb1f1c5880' 
  AND token = 'EZhddvTpUFJXsNUYDIwBvWsyKvLxylrbIUg6YO8he6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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