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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f406f733436fc909a3c24b44fc77c8500aea6eed3f31366ef8255f7ff4488c35' 
  AND token = '3KH8wW5HUzqu3M5Emn4zaBAm09U9K6R4rSaU89Z4WQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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