SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71bcc5107f8a70dfc261c749b330cdcdd6e53e762463ecf3826744df63cb9c83' 
  AND token = 'yzLY8hg/vQnBPBkiYl7QfO+qQZXvM4pe05HX908XJ7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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