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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae07674bde4827b55f4ff4f9c35f35dc140a0673df59f55ee1cf529e82084cc' 
  AND token = 't30ha264zx7Zu/TxNm7j4BGFyHFwV35C7zdp0r/Yd8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00464

JSON explain

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