SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '934d37e6554804ffe249c37c116251176fc0e81f331b534990d156a2c09b635c' 
  AND token = 'TgXBHCuYzEisBf4xVhDOREx1HlToGN0+Ph6NSp/oDFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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