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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c3c67fe580097b53b8341f5778b6843b2a6ecacd62acc59e878966af8971275' 
  AND token = 'ON9diEx2viwuMfxhAx7WDqLrUl2twMFl5yjkYzpCarI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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