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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b0d89b82a1dd64f9b6dca9f662d4e9d6bed433f60f15f727d170264d90cdb4f' 
  AND token = '1hTKj6c83Hm2CLSYoxZVBPox5f+8BZ9pc8WTSI3J5LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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