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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b6efdaab3eee4ce85d1f68c7e0e4e5a020c709cb39f56465d2ce5317ccbdbe2' 
  AND token = 'Y7ed1qs/qB8cbx1sMqt435BeEue7WGNHEFW0H8NXd2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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