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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb8c96a0f681e902035bebb7f59a69bfb3ab0f460aea92bea6540616d2eae19' 
  AND token = 'yB0xcAdSeiqH1leowvlH1kLaY/1btWC6SrewV4N7uZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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