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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '729ec4294e1f27792aeb16287a61ce6d9ef993dabe7f41f9bba42df9416ea7cd' 
  AND token = 'yj679ZdlWZIYj53E7SvpV78oRmVpB9Rg6SmFM939tWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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