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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '582f17d7392d72b1aa6d79f4097d78a656c947edb5e2493f00229be0c9cb5edd' 
  AND token = 'x50vFbG25t4nu/4u0o3WLFOD4bQIu09knvBlW35LYsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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