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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b00979ed2ec5738afa118533c7b8b7076b79e086ae9b94f6e5bb6a28afae630d' 
  AND token = 'YANmQO40oH6Zpl/pOiMLMaTNHhB8FKusS0E1UGhrueY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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