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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebd46fecc9d8411ec62b34ad69a6602267d4b33cb3d1cdd104c3f3c937197b40' 
  AND token = 'jEYwnXJKEmN+29sIrcN62fcRicjm/MWfelFhX2mB2ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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