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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b85848e29227018e954b600b72c94722cc989c6c0a2980d28f3109d5811450' 
  AND token = 'Ha+4BXyT11IIqtnPM4RKy1C+7650tqcVdt5fNfsZGaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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