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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b48b353869e079dae9533490069321d7698a0c071fe9308f55d6302ee721033' 
  AND token = 'xix3xexKd2jcaLO6LxvCwevu/aP2a8VGWZw1qcC7OSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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