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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12b8c693e5e59469e78ec8d5957e2b9cce246cd1003b9c095b556fe17d144612' 
  AND token = '8cv4d0yLTyadCzya8nZnFg84kbO1gLH0B2Ag8mH6Q7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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