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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2a3376135474ae082b8ab68765ad00d645b848a970c1cb63b9a6ea387d3d6fe' 
  AND token = 'tF3XaII9J9IDH9m20UQHDkwKFpcUbP4FnhREbPOCj9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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