SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2089662e529dc78c38b791935447449707bdc9674d084df7f8cf465ffe408c16' 
  AND token = 'njVPNKOJyAbH7S6qSmaw0G3sFzKz1TY9AfXSUMuLtGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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