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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9ae0ee735e383dc6f48ecf5c8318298861f7703e645c32396f0434ae4d18dae' 
  AND token = 'Z4LUAQB4f4pTILVPsyX5hW379D2HPmDLO9NZD2HYpKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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