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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38dff913db822a9ea5c4eacf4efff8e944256b69c544197d12bed12c3589e976' 
  AND token = 'ALtz5PM0AH+HOZUDcuULv7FGeA80QYl88fGwk6GqIos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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