SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a41f52fb4d59a4c801ef7621919fc2d380b9d46404cdc4138ba1ffc3ba3a7bf' 
  AND token = 'uhcAM71ryozVrQZw6FBXhqdKfac/ps6UEtbwoyvmPYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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