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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '517ca80a140f73de529209268f57a7ee3b2a6498ace34f98b8b29a0393b393ea' 
  AND token = 'AhDk4KH5eTD4f94KF/xr9C6WRiQ9sdFCB7H2EjnxfnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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