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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bebc54d6dee7003d3de81634726cb123063d710d4503bf89625f9d2f83b1b255' 
  AND token = 'TbdzFWRVRR7fT2IhFTleyOdO5W6MKZyAnc+U4UBYXVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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