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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76346c77d63344804e3a8690a1accb4297a1457736966c8a60f20f570a39c542' 
  AND token = 'hhEVEZBxqqiIzdkkHSZBAQeAyK7zk47EFDT6aGmAMwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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