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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b73fae7c84964057f6aa6fa9e25380b98c84020209957425924f354ba837c446' 
  AND token = '172A0HToxT8qGBJEtUBdsy2FF5AZ9LxoPFvEx+/1kIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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