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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0a94a392d523d82c6c8dccfa260959257c6763a5e33e99ef0106f248a660c7' 
  AND token = '/wixjmGkZxmqA72F0EUGZbdklNsobT5Vg0TB9BkaNk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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