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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6860997e572709866e6b7ad4685bbd51ffeaced341836637d095c7cd2bb8c93f' 
  AND token = 'obaePqwE+EnvtJQu4zcpmJ+Y/IZAoQXrA8XPi5vJS3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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