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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd226e3d23af171eb9c4cdc226d260b07c2b7c79131dc13337047d3d0393b56b' 
  AND token = 'KzqMbMlyyn9pE6qwQELZ5OT8mmtEGDCJ6wwjMYaFrjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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