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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b8efa5c1be9ac2d9bef000460b53895cde37b8237977d7b6dc9d45f9801fecb' 
  AND token = 'l10dRwdk/24nAH6vwY46ooe5WmN4dYfSXrCAiCHSThY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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