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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e68be2c7af61ad7efd59113d372fd1aa028516a078fbccfa063cba84666986ad' 
  AND token = '0DmPMyyMh1YjaPKMMkS3gru0f/LqDXGR43VawETSOaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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