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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a4dd757b051e98d1924c6fc0aeff135c6e4d6bffa41ab3c4650a487bfaa7c5f' 
  AND token = 'eNL7W//6LjzZsrH6ONFs6uZasz1heA+QmiR20yeF39k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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