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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '614157dc3d5bb6057b8d7c4012ce4dca6d7ca223220236f46e6c7c4827a879ad' 
  AND token = '+FkRdj4qGa8VBSGTqDx2eFglRYp/xId0wbtCXdfg+tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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