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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '512075561aaec8b14c7fcbe92da347ebe629716b91b50c9263da91e6c63332e7' 
  AND token = 'LCapnRyNBw/owcdHofNZr/n38xT+wp1joDEDV3HFFzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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