SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '205570784faca712f594cfdd94519464bb118b48b67bd933081c3a595d36ba2e' 
  AND token = '0+ZDRgSKXyCc+SGvudkAYNyDBLzPzj8TKWzq1d4XjzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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