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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79adac9c38f8071896afe5c21c60bc3fe956bf9663a4f08e36268bf2d4e8765c' 
  AND token = 'x5UaoxlHIvDxJD2J0LcuK7YSgp6ttoeAn19lUkoZNIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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