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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bebf6735c15936c27ea5a8b445bb625c2844b94924310cab90eb2446da3b16ae' 
  AND token = 'f06ZWduUqiQa6MhrZDKUpSbMxPWX6B561vaBxu8XhSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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