SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '109610f4551530224d7ebfbb5787f963fe1035b96e336dd929168332ebc4bf90' 
  AND token = 'I9G9jQJ1wdlYTws+7ref7mH/QeYUJNz8Wk/axZyxvOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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