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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03ae805cdc0a0f7698e81cb72502da19ce36d5eb64b86f0617f1ae854c09ec57' 
  AND token = '+8IFj5hK3PXNcbbiS0nCy7Yu55qe+Jt0WHmgDJ1rc3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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