SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12214b9ddf94a9ff0120a36cba52fe2b44d4b9b1a583157803792d36b5baad73' 
  AND token = 'nOvyrC0a4mbv/weGPxj5ZdXKIGZwJLfVXprDvltEurw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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