SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cde94f7a9abfa65774bcd8cdb31628c0a3462516c87369d76b0fd209dc583d2' 
  AND token = 'jI4huatkoQI+nIqbKMgPHpKLbKBmHvEN84K2P+zowHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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