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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c633b0c6b95e44fdd91ee3b29c4d50408465f1de6f6149c4a57d4b25b39ef7c0' 
  AND token = 'FtGxfSlCEZooJ3MvNmBF+oERmW+ImXKi0Lje5EW07lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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