SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e2e0578138480f2732e5b8adf7a89e005b13ae3efeb2c6abf0acb71aacd30f7' 
  AND token = 'XghMSzULo13jztz+hb5Mg2Nl+VuK+VIHak/StSpbBN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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