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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '679ef6ed2dce1c37ba04731c54ce22429d581d2c7a35d82ef7750117fdb32487' 
  AND token = 'bjBGWdZh+nzKRWWjazx/9kDeBsGaHHCDEuPCvH0cGjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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