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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09614602c6e93120b5115b9e6fbba7ddd1e7aaa52a5c8d9a3de1aef0fb933f41' 
  AND token = '9GUvdohtbjkrJIo6w6uRhzgMYEz5JfzDPIFTKFdj9nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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