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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '746f5ba7fc51aaa9ad24602317b79a1953a656d4d4c229fd53027c9b4bc14fcc' 
  AND token = 'aL7UWKRu3PX1uVlViPUYh/ziL0m/eqkKOVyAlMsk3po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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