SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acc456acbc95378140fc5378abdf9251e2392a2660c3408ed7d7e38d2f1fae34' 
  AND token = 'TLZgAk9gjyJjBidsJ7AGS5wuJ8Es+7NsLYXwJZTCovU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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