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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b1306263080453199c1e58c4167250fb20793affa6ead2bf4a8aa275138a9e6' 
  AND token = 'OVT+iykiuTJZQ0Wn9e/3dCj6FZ+7wznS6ApnC6XRwxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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