SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '363f43f80f5f70921dba83caa1678ba754206b7678ed3e679b3f22319fbef06b' 
  AND token = 'rpzudYSh/1kz5I5BlCq2IQuxNAnuVMYrDdVwXMpfWnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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