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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a765b98d7fcf748c87bb37c20455be8a2e1b4421d8310c5c581325babef63400' 
  AND token = '+MYUEEZejDKp1ONl7hFpiA/fnnoFtMS/sdXZSo88vJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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