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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029fc8c876e1cb48f8c4f1f9d98686363db25090ca94ba2179d7ed4fc60145b7' 
  AND token = 'pFc4tx8/D40hEQuopzYF0a0vWMzB8qIc8hGDRDxsxgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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