SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d636bdb5465ee23b031654f8fad251c1b8c92f94460bd364319b05aa72ec85b' 
  AND token = 'Punefvz8XTXLSNZ/jFxv9dGwCoRJZKAgXU0WVeD/TFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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