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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e4f475a01b2107ab9b8915dfcb5f7c2f306ad4f7e4a5ab95572dbe2983d848' 
  AND token = '/fpzfQlgJ5lriDvA4zQM+qRPA9cvDasetX8adnsTqpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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