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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '630517eb73c85f04918001a523dfd0bf91cc13e0a0689a0ee30fa34958f84dd0' 
  AND token = 'UPoB4a/jaZqtt1GcXMs02B4ud73DdKF8rxrmLSFScZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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