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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b1e2a376d131d633183f61c21d57183e94ba85684388623751573172b987643' 
  AND token = 'XYsa1ninfgq/DnkP4JFw9wUTcq0L/9mDS3qBE0myd5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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