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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55b6db4989a526d1058e1e4aef953237ef49f802cba6bb365c10fe78adfb8f35' 
  AND token = 'EeF0TW4MLXeFO9IdIrhgLi7eu2d1jg+DlbnTBekY1xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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