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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd4235981c58157a6224ced9b852078d79286dc697612390d9b8c4a1176e6719' 
  AND token = 'smeWPbLmpMfW+X7wM+wtrytgkMO+kxCQwv+WcKVRmxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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