SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97e7828059907a6aa5fe89df02129f9310830e105750bdab92c69be73ca0bdfc' 
  AND token = 'xnT/xYmQfCqUZ2xVbwEFM/G7sAtnnJYALjoBTqGFzXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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