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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c821fea04156c437c4600ab63e803926348a13e11868248715d1cfc13b97f6b3' 
  AND token = '1bFvK9sJ3GBSx8UmWRfRMiV/y1w460gIfW0aNegiQrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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