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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0404a8fccef5ae1a36dec26b587bbed47b5b0c4f844ffad12dbe51b0c641c338' 
  AND token = 'Q7rRuZcYUk9ygcovbbkwaCCYohGmnQKcmMcep1XWdPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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