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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac5804bc87ee0ea8c63869aa0c27a58c888c522e5781f7b6fdb6c2507172022' 
  AND token = 'XG5dxfcXbe8hLFkygINSH8MrE8SVSDdczE8IddLst2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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