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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc96c5196d23478d7979fed1003055db1e65bc2e45d96739cd7d9b6fe3dcd7fc' 
  AND token = '0V0i9em3eRjUcKcpiB3/MA3ZNIxxgeKYDxnnwqj423A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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