SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb9d8d6c808bdf6b04b55cbf9873592a8f6a168786bc2f37814cab1533695d37' 
  AND token = 'szdgdH2ZXGdjc3r/aOzpMlKQwiQAMEQjdvu/XqmMG/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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