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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a40f6e03668241507b1f808de58649035d21c99195d723b7283fb5b93c0bce4' 
  AND token = '5PT5Uyp7lrjIpluf5ghgA2vKdKJ7+8kd9L4O4lrNgR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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