SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb92b2dbbad38b2830c8e745f470382daecaab386c73b4c37b328ff6319d56e' 
  AND token = 'sGFinBQRh82sNlxHwhaZr/NlaPoTq+zt9ybDYqIZCng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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