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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71fa75bfa0c71b98bf467331371acc62021dbba7143dd136b5b94ffbe3d8c006' 
  AND token = 'lUqHruKC5fhy0EO/OU5osxOxEXFFKzD33MhWmOKJqbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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