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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9d4fa98a0be6ef83e5abce6e58d7d13ade7e10a27b3d42e370005de7ab67013' 
  AND token = 'fcy5VTweZ0CMa9lRKNsFnHvumQLG8nIwlnoOI19CAFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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