SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58440f5362446500e73189b2a0f7b59b3616a82563b136675ecbc698c4bce01a' 
  AND token = 'zZEbyQMyxNmDZS1OO9CJJuYThVXHBoiVKD5oFcpNnmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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