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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c059ed9f2bffc3a8717b00b56fc8c890bec5408e19ad08019b9e4ad2c258eea' 
  AND token = 'gDKs3ehjThqKq1FoWh8FGmpYa0LOU54Yyp9253PhtaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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