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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3029fe5ea6fafa92e574b251d19a9d72bf0cbfacf548bba3800e824b6142257' 
  AND token = 'Dv1CUM8lDBQ9YYmBOQb4O+pHdQ8ZcIMqajMoPKPcjfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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