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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b859b40bc7903d4c43153b89afcf24853d41c9eab8e404b9f256fd1cfe049084' 
  AND token = 'cLtPSLA0jbMHct3O1IohCigWkrX/I3xfFMcDTMWw43g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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