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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91781361ab62b1b0c517a030e61affedbced7c2d2486327193200a398c08dbdb' 
  AND token = 'xHW3hi7Oh/7uNj1eoby3qTVa8FHqn8yaG59sWD2mOtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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