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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fba833d423da3f3d8de57754bfa69be6d8a673eb3b54f908ba5a507e009f2f6' 
  AND token = 'cz+YO4XE6vaDQo1dOeSVjIGA8lQZtRmj1SI31yZXf/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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