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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86fda93a4ca2e0206e9f13ce3146da0e920fe4ad688d52418b97bf9b8ddfd1aa' 
  AND token = 'scYL2swB8cI8M7TEXeZhEfet7b2hkSFFvBF0MhmzBKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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