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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eb931bc25cf4a9d1afc047d7a7403619c745ea9ce07b0df1e8a160c356eb377' 
  AND token = '6yxzkLRktkv+Zd+rfJjaqR80LsgS8h6dJYWog/xDxRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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