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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '162662ed714c4c61c53acc0dcdd6e5f891e970d18726a34755f36457bd537d16' 
  AND token = 'd1w0knkF6xdGrZ8iayfidCteTF+DzqQyrD9UXcb2HYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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