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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98bc439fab666d02c48ff35e5b98c662ad8c535086f4089908ac518973187e6d' 
  AND token = 'fG2nHtEWKTw+bmK755l6cQ6C/kvOY35nh14v9pdeK5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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