SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c85860b4c981d7223304972db41f4db89035e106d8013a7b6a6ddcec9119f25a' 
  AND token = 'CIDJxmOEGMHPERGst16BdxMrziKnwVb3KrSROYhvF1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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