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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ffb37c539682c7e5df2336dba6330d06bf9fb24eafdc8a684f4f81a360ffa4' 
  AND token = 'GkUJswyxVAgEBiwMy4aHTxNRkPnq7pyvwEjWove3O2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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