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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54251a7606ec0a339f36e30fddaa81fb8ef042a1f8f651248c9e25f67cd96877' 
  AND token = '/Hoa0kUvl1u7Za100lHrXjIFVn+T24UKscf+l+VwXt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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