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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a816f2eab5043fd51ed4797193a26de4ba2a2dc9c70013d336227576788ce0a' 
  AND token = '4XTKBGh6cmswwPDlRmA30hgoKr8YfVB0Va8pNbFF5XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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