SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ce46e52cbbbd6c6d3b5dbf5ee37745510fbafc42f85c4c9770b2bab3e75920b' 
  AND token = 'PtS+/bpRrEgoaeXxJlccjdiM+gtGzKga9QhYK61op/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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