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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '558fe823e78d06d4f53cd61311fa655338bf203afaeeeee84feb85ff6f83f7e4' 
  AND token = '4NvVFySR3wjp9lq+/9XcxMKi3jziINW8pm9rf7nuIUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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